Founded in 2015
Faculty of the Built
Environment & Architecture
TU Delft, the Netherlands
Brief overview
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The team
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Our (over-the-top) website
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Urban environment and 3D geoinformation
Our focus
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Whole North Rhine-
Westphalia:
10M+ LoD2 buildings
More and more 3D data from cities
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New York City
More and more 3D data from cities
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Helsinki: with
textures
More and more 3D data from cities
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Whole of the
Netherlands in LoD2.2
More and more 3D data from cities
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Why 3D geoinformation?
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solar potential
shadow analysis
noise modelling
energy estimation
bomb detonation
wind turbulence
pollutant tracking
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3D use in mainstream media: NY Times
https://www.nytimes.com/interactive/2016/12/21/upshot/Mapping-the-Shadows-of-New-York-City.html
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Some projects
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https://3dbag.nl all 10M+ buildings in the Netherlands
Point cloud
(AHN3)
Footprint (BAG)
+
X 10,000,000
100% automatic
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https://3dbag.nl
• Collaborations between https://3dgi.nl and us
• Whole workflow is (will be soon!) 100% open-source
• Roofer: C++ library for LoD2.2 reconstruction
• Pipeline from raw data to buildings in DBMS + CityJSON
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Another 3D reconstruction: City3D!
Airborne LiDAR LoD2 building model
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Highly-detailed reconstruction
3D trees from laser scanning
3D buildings from drones
Check our
website for code!
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AI for understanding 3D textured meshes
Funded by
Cyclomedia
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Semantic segmentation of 3D meshes
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Semantic segmentation of 3D meshes
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Quality control of 3D city models
Automatic repairing of broken 3D city
With my colleague John Zhao, we’re making an overview
of the most common errors/problems, such as:
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http://geovalidation.bk.tudelft.nl/val3dity/
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Wind simulation in cities
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City4CFD: reconstruct CFD input automatically
Only open-source
software is used
OpenFOAM
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LoD1.2
LoD2.2
UAV safety maps over urban environments
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SCIENCES, Marie Curie grant
Energy and CFD modelling to minimize energy usage
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No content
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• community standard
• compliant with CityGML v3.0
• subset of CityGML (~90% of features)
• software for full conversion CityGML <-> CityJSON
• several software support CityJSON
new!
CityJSON v2.0
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CityGML = 3.0GB
(but 1GB of spaces/CRs/tabs!)
CityJSON = 292MB
Compression of files: Zürich LoD2 buildings
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GeoBIM integration
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RhinoCityJSON
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● Generaties City models’ geometries and
attributes in BIM environment
● Reprojecting and translating data based on
metadata and coordination referencing
systems (CRS)
● Available at Autodesk App Store as a free
featured app
CityJSON importer for Autodesk Revit
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➡ [email protected]
➡ https://3d.bk.tudelft.nl
more info than you probably need!
projects, papers, code, etc
2 courses are open (book+YouTube):
• terrain modelling (AHN4)
• 3D modelling for the built environment
Thank you